You want to follow a flight? What information do you get?
There are several providers that offer a flight tracker. Therefore, the amount of information offered to you can differ slightly from one another. However, it is very likely that the information is always sent by the corresponding transponders of the aircraft. These include, for example, the current course, the airports, the current or average speed, the distance already traveled, and often the distance that still needs to be flown. Sometimes you will also be aware of possible delays, the approximate time of arrival or the terminal on which the passengers arrive.
All this data from the flight is largely identical to the information that the passengers on board can display on their screens. This is precisely the information that the corresponding transponder emits.
You see, track a flight is an incredibly practical matter, which can be fun. All this is easy, live, for free and without any further obligations. The data are already prepared for you so that they can be displayed via an Internet browser without additional programs or apps. To track a flight has never been so easy and comfortable.